Fan attachment for sewing machines



I 2 19 y 27 s. RENNA ET AL FAN ATTACHMENT FOR SEWING MACHINES 2sheets-sheet 1 Filed Dec'. 27. 1926 INVENTORS July 26, 1927. 1,636,758

5. RENNA ET AL.

FAN ATTACHMENT FOR SEWING MACHINES Filed Dec. 27, 1926 2 Sheets-Sheet 2I A TTORNEX Patented July 26, 19?.7.

uirao STATES 1,636,758 {PATENT "OFFICE.

SIMONE RENNA, OF BROOKLYN, AND IJEUIGI RENN'A, OF NEW Y ORK, N.,Y.

FAN ATTACHMENT FOR'SEWING MACHINES.

Application filed December 27, 1926. Serial at. 157,191.

The present invention relaies'to improvements in sewing machine.attachments, and has for an object toprovide a fan and supporting anddriving means, whereby the movement of the fan may be occasioned by thedriving mechanism of the sewing machine, and whereby further themomentary stopping of the sewing machine or the impulsiveoperationthereof may not interfere with the continuous movement of thefan element.

Another object ofthe invention is to 'provide a fan attachment forsewing machines, in which the fan element is mounted for adjustment todirect the air in any desired vertical or horizontal line toward or awayfrom the operator of the machine.

A further object of the invention resides in providing a fan attachmentof simple, compact and inexpensive form, and which is susceptible ofbeing attached to; the. machine without requiring any alterationtherein.

With the foregoing and other objects in 'view, the invention will bemore fully described hereinafter, and will. be more particularly pointedout in the claims appended hereto.

In the drawings, wherein like symbols refer to like or correspondingparts throughout the several views:

Figure 1 is a fragmentary front elevation of a sewing machine with theimproved fanattachment; V

Figure 2 is an end View thereof;

Figure 3 is a fragmentary rear view of the same;

Figure 4 is a fragmentary vertical sec tion taken on an enlargedscalethrough the fanshaft and its supporting .means;

.Figure 5 is a vertical section taken on the line 55 in Figure 4; I

Figure 6 is a similar section taken onthe line 6-6 also in Fig. i;

. Figure? is a section taken .on the line 7'. in Figure 2; and

Figure 8 is a cross-section taken on the line 8-8 in Figure 7.

Referring more, particularly to the drawings, 1O designates the tableand 'llfthe inetalframeworl-t of a usual formof sewing machine havingthe, belt pulley, wheel 12 driven by the belt connection 13 eitherthrough a treadle or by other appropriate motive power. I r

In accordance with the present invention,

the drive belt 18 is, utilized to drive the fan I arated.

element, "and for this purpose a grooved wheel 14: is provided to engagewith one run bracket arm 19 having an opening 20 to freely receive saidbearing sleeve 16. The

bearing sleeve 16 is held inplace against exial movement on the bracketarm '19 by means of the post nuts 21 and 22. 'Byiru'nning fone ofthesenuts off the sleeve, the bracket arm and bearing sleeve maybe sep- Thebracket arm 19 isshown as extending down and adjustable horizontallythrough the'slot 23 an'd set screw f2l, the. support for the bracketarmbeing had from the vertical-web 25 of amain bracket, provided withthe horizontally j 'elong'ated slots 26 shownin Fig. 2, to receive thepost or set screw 27 projecting out "from'th e sewing machine standard.

V The web 25 of the'main bracket isprovided with a horizontal webportion 28 for "sustaining at its innerfree end thepostfl29,

which carries mean, this post being provided with-the collarBQ', havingthe slotted eXtension -piece 31 j for receiving the set screw andpost32projecting out from the upper portion of the sewing machine column,whereby to steady the fan post 29] 'At'its upper end the fan ,postisprovided with the longitudinally'perforated'block 33, having the setscrew for securing 1n adjusted position the rod 35. v This rod isthreaded at its upper end, to which the nuts 36 and 37 areapplied,holding therebetween the intermediate portion of the faniyolre 38. shownin Fig. 5, the fan yoke is provided with" the trunnions 39 and 4:0,which engage at diametricallyopposite'points the spherical block e1.'lhroughthis block and extending at substantially right angles to theaxes of the trunnions 39 and 40, but

in substantially the same plane therewith is a bearing sleeve",42".having its ends 43 and 4H flange d. The bearing sleeve is adapted to receivethe fan shaft 45, which projects beyond both ends of the spherical'bloclr, carr'ying at one end the grooved pulley 46, engaged by theyieldable, resilient or stretchable belt 47 driven by the grooved wheel48 carried upon the shaft 15 and drivenfrom the grooved wheel 14, whichengages the drive belt 13 of the machine.

The grooved wheel 46 engages at one side against the enlarged flange 44of the bearing sleeve 42 and at its opposite side aga nst the nut 49threaded upon the projecting end of the fan shaft 45. The oppositesmaller flange 43 of the bearing sleeve is countersunk in the sphericalblock 41 and relieves the block of the wear of the fan cage 50. This fancage is shown as composed of four arms spaced at 90 and having theirfree ends bent outwardly and carrying therein the wire guard 51 at thefront of the fan, the blades of which are designated at 52. These bladesare carried by a hub 53, which is loosely mounted on the fan shaft andis provided with the inclined or ratchet teeth 54, as shown in Fig. 6.The hub and ratchet teeth are contained within a casing 55, to which issecured, as indicated at 56, a long volute spring 57, enveloping theratchet teeth 54 completely and having its free inner end disposed toengage against the abrupt shoulders of the teeth for driving the teethand incidentally the fan hub and blades in a counter-clockwisedirection, as viewed in Figure 6.

The casing 55 is composed of the outer circumferential rim 55 and theright angular disc 58, which is affixed as by the nuts 59 and 60 to theadjacent threaded end of the fan shaft 45.

The spherical block 41 is provided on its end portion with an arcuaterack 61 engaged by a dog'62 having an arcuate tooth engaging edge 63extending at right angles to the direction of the arc of the rack 61 andhaving its convex side disposed toward said rack, whereby the dog may beswung out of engagement with the teeth of the rack to permit thespherical block 41 to be adjusted about the horizontal trunnions 39 and40. The fulcrum or pivot 64 of the dog is shown as being carried by anupturned ear 65 extending laterally from the intermediate portion of theyoke 38.

In the use of the device, the movement of the drive belt 13, as by thedepressing of the treaclle of the sewing machine, will operate to rotatethe grooved wheel 14 in contact therewith. A like rotary movement iscommunicated to the shaft 15 and pulley 48 thereon. The belt 47 isthereby driven, driving in turn the pulley 46, fan shaft 45, casing 55,spring pawl 57 and the ratchet hub and fan blades. Should the sewingmachine be momentarily stopped for any reason, the fan blades 52 and hubcarrying same will continue to rotate in the counterclockwise directionindicated by the arrow in Fig. 6, the inclined sides of the teeth 54simply slipping over the free end of the volute pawl spring 57 andracing ahead of the housing 55. The same result will be had when thesewing machine is operated i'itfully. The fan will not thereby stoppedand started impulsively, but it will be permitted to rotate more or lesscontinuously, its continuous movement being had by the momentumpreviously acquired.

Various adjustments are made possible by the slot 26 in the mainbracket, enabling the fan to be adjusted toward or from the operator. Itmay also be raised and lowered by adjusting the set screw 34 and theelastic belt 47 will take up any slack that would otherwise occur in aninextensible belt. Moreover, the. fan may be directed up or down byfirst disengaging the dog 62 and then swinging the spherical block 41 onthe horizontal trunnions 39 and 40 of'the yoke. The tailpiece or handle66 of the dog will possess sufficient weight to swing the dog back intoengagement with the teeth 61 merely upon release of the operator. 1 Thegroove in the pulley 46 will be sufficiently deep to hold the beltagainst escaping when this last mentioned adjustment is made, asprovision is also made for supplying'lubricant to the various parts.

It will be obvious that many changes in the construction, combinationand arrangement of parts could be made, which could be used withoutdeparting from the spirit of our invention, and we do not mean to limitthe invention to such details, except as particularly pointed out in theclaims.

Having thus described our invention, What we claim and desire to secureby Letters Patent of the United States is:

1. In combination with a belt driven machine, a fan, and means driven bysaid belt driven machine for communicating movement to the fan and forcausing the fan to run free of said means and by its own momentum onslowing or stopping of the machine.

2. In combination with a sewing machine having a belt drive, a fan,means for driving the fan from movement derived from said belt, andmeans for causing the fan to run free ahead of said drive means when thebelt is slowed or stopped,

3. In combination with a belt driven machine, a fan, a ratchet mechanismfor driving said fan in one direction and causing the fan to run freewhen the ratchet mechanism is slowed or stopped, and connections betweensaid ratchet mechanism and the belt I carried by said bearing member,means for H driving said shaft by movement derived from the belt, a fancoupled to be driven by said shaft when rotated in one direction, andmeans whereby the fan may run ahead of the shaft when the latter isslowed or stopped.

55. In a belt driven machine, a support, a bearing member carried bysaid support, a fan shaft journalled in said bearing member, means fordriving said shaft, a housing fixed to said shaft, a fan having a hubloosely mounted over said shaft and provided with ratchet teeth in thehousing, and a volute spring secured in the housing and wound about saidhub with its free end engaging the ratchet teeth, said free end beingbiased to the center of the hub.

6. In a belt driven machine, a support, a bearing member carriedthereby, a fan shaft journalled through said bearing member, means fordriving said fan shaft, a fan loosely mounted about said fan shaft,couplin means fixed to move with the shaft and to drive the fan in onedirection, but to release the fan when stopping or slowing below therate of speed acquired by the momentum of the fan, and means foradjusting said bearing member about a substantially horizontal axis.

7. In a belt driven machine, a support, a yoke adjustably carried bysaid support, a bearing member swivelly carriedin said yoke, a fancarried by said bearing member, means for driving said fan, a rackcarried by said bearing member, and a swivel weighted dog carried bysaid yoke for en gagement with said rack.

In testimony that we claim the foregoing as our invention, we havesigned our names hereto.

SIMONE RENNA. LEUIGI RENNA.

